#include <stdio.h>
#include <uv.h>
#include <stdlib.h>
#include <unistd.h>

uv_loop_t *loop;
uv_async_t async;

void print_progress(uv_async_t *handle)
{
    double percentage = *((double *)handle->data);
    fprintf(stderr, "Downloaded %.2f%%\n", percentage);
}

void fake_download(uv_work_t *req)
{
    int size = *((int *)req->data);
    int downloaded = 0;
    double percentage;
    while (downloaded < size)
    {
        percentage = downloaded * 100.0 / size;
        async.data = (void *)&percentage;
        uv_async_send(&async);

        sleep(1);
        downloaded += (200 + random()) % 1000; // can only download max 1000bytes/sec,
                                               // but at least a 200;
    }
}

void after(uv_work_t *req, int status)
{
    fprintf(stderr, "Download complete\n");
    uv_close((uv_handle_t *)&async, NULL);
}

int main()
{
    loop = uv_default_loop();

    uv_work_t req;
    int size = 10240;
    req.data = (void *)&size;

    uv_async_init(loop, &async, print_progress);
    uv_queue_work(loop, &req, fake_download, after);

    return uv_run(loop, UV_RUN_DEFAULT);
}
